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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
REM Rebound. Since the body needs REM sleep, it has developed a way to recover from sleep deprivation. This process is called REM rebound, which involves shortening the amount of time required to reach REM sleep. Normally, a person requires between 90 and 120 minutes to complete a REM cycle. In the case of REM rebound, people can take much less time to achieve full REM sleep.